Grinding wheel dresser



April 21, 1959 H. H. cAl/:F'BELL 2,882,887 I GRINDING WHEEL DRESSER Filed Aug. 10l 1956 4 Shee's-Sheet 1 I I I 40 I zi I I I I 1.

EV INVENITOI;ZZ

April 21, 1959 H. H. CAMPBELL 2382,887

GRINDING wHEEL DREssER Filed Aug. 10, 1958 4 snee'zs-sheet 2 IN VEN T OR.

prifizl, 1959 H. H. cAMPBl-:LL 2,882,887

GRINDING WHEEL DRESSE'R Filed Aug. 10, 1956 4 Sheets-Shet 3 NVENToRL April 21, 1959 H. H. CAMPBELL 2,882,887

GRINDING WHEEL DRESSER Filed Aug. 10. 1956 4 snee'ts-sheet 4 NVENTOR.

nited States U GRINDING WrrEEL DREssER Hugh H. Campbell, Muskegon Heights, The Kaydon Engineering Corp., corporation of Michigan Application August 10, 1956, Serial No. 603,300 6 Claims. (Cl. 125-11) Mich., assignor to Muskegon, Mich., a

designated contours on the edge of the wheel. Other devices of this character have employed pantograph arrangements for supporting the cutting or dressing diamond.

Many of such previous devices have employed hydraulic means for powering the movement of the dressing diamond, but as a general rule, it may be stated that the hydraulic means employed heretofore have been of complicated character so as to make devices of this class comparatively expensive. Simplified modifications of the hydraulic system have been attempted by replacing the hydraulic actuators With suitable mechanical means. Such mechanical devices which have expen'enced any marked degree of success have generally been hampered by a lack of versatility in movement especially where fixed template control means or other fixedv pattern devices are resorted to.

My present invention seeks to provide an improved hydraulically actuated wheel dresser which is capable of versatile movement to avoid the drawbacks experienced with a fixed template or pattern member as in previous mechanical devices. At 'the same time, my device provides hydraulic motivation of diamond wheel cutting means to facilitate ease of operation and versatility of control. The arrangement and function of the dresser in the present invention is believed to be extremely simple and effective, making its cost economically desirable.

Basically, the improved dresser of my invention ematent C) tion for a grinding wheel dresser while the control of such movements through the application of hydraulic pressure greatly facilitates ease of operation and accurate control. Suitable mechanical screw members are also associated with the three major axes of movement to assist in the location, adjustment and operation of the dressing diamond relative to a grinding wheel as will appear more fully from descriptive materials hereinafter.

- The main object of my invention is to provide a new and improved contour forming device for dressing grinding wheels and the like.

Another object of my invention is to provide a new and improved grinding wheel dresser of .the character aforesaid which embodies three major axes of movement disposed mutually transverse to one another and of which two axes define paths of rectilinear movement while the third thereof defines rotational movement.

Still another object of this inventionis to provide a hydraulically Controlled mechanism for moving a diamond abrading means adjacent a rotating grinding wheel to effect variously selected contours on the cutting surface of the wheel.

An additional object of the present invention is to provide a new and improved wheel dresser of the character aforesaid, which is reciprocal along two lnear axes disposed in spaced parallel planes and which `is rotatable about a third aXis disposed generally transverse to said two planes.

A still additional object of this'invention` is to providel a new and improved hydraulically actuated diamond dresser for use with grinding Wheels which is especially adapted for dressing radii and planar surfaces or combinations thereof.

The above and further objects, features and advantages of the present invention will appear to those familiar in the art from the following detailed description and specbodies hydraulically actuated means to produce movement of a Wheel dressing diamond along three distinct and independent axes. The first of such axes is generally preferred to be a Vertical one or one which lies transverse to the general plane of the wheel being dressed. The entire dressing device moves along such axis with reciprocal linear motion. A second aXis comprising a rotational aris is disposed transverse to the first named axis with the wheel dressing diamond being movable through an arcuate range between limits about such rotational axis. The third axis lies substantially transverse to the second rotational axis and in spaced relation to the first named aXis. Movement of the diamond along such third a'xis is reciprocal and lnear. The various combnations of movements produced by the co-action of the three vnamed aXes' :bring forth 'desirecl'versatility' of operation. and funcifications of a preferred embodiment thereof illustrated in the accompanying drawings. In the drawings: I

Figure 1 is a front elevational view with parts broken away in section showing a preferred form of wheel dresser embodying the concepts and features vof the present invention;

Figure 2 is a top plan view of the structure shown in Figure 1;

Figure 3 is a right hand side elevational view of the wheel dresser of Figure 1;

Figure 4 is an enlarged partial view in side elevation showing the arrangement of the wheel dressing head assembly of my improved wheel dresser;

Figure 5 is an enlarged partial top plan viewof the wheel dressing head asembly illustrated in Figure 4; I

Figure 6 is an enlarged partial cross-sectonal view, taken at line 6-6 of Figure 2 tov illustrate details of the Vertical hydraulic cylinder and piston means employed in the wheel dressing device of this invention;

Figure 7 is a cross-sectional view taken at of Figure 6;

Figure 8 is a detailed enlarged elevational view of the dressing head assembly shown in Figure 1;

Figure 9 is a schematic represention of a typical hydraulic arrangement for actuating the wheel dresser of my invention; and

Figure 10-14 are successive schematic representations of a typical dressing operation capable of 'being carried out by my improved wheel dresser and showing especially the operation of the same in dressing a grinding wheel having a contour formed by a pair of planar inclined faces and an interjoining radius.

Turning now to the features of the device illustrated in line 7-7 i Figures 1-5 of the drawings, the improved assembly of my Patented Apr. 21, 1959` 'cpr'ocates reltive to the fixed position 89. A suitable slide plate 98 disposed along one lateral face of the housing portion 85 and formed with turned over flange portions 99, 99 (seeFigure is provided to guide the cylinder 88 relative to and within housing 85. In this regard, it will be noted that the upper and lower wall portions 100 and 101 of housing portion 85 act as bearing ways for the slide plate 98. Housing 85 also carries a second stop pin 103 opposte the adjustable stop pin 94 for limiting the throw of the cylinder 88. To accommodate the movement of the fluid inlet conduits 95 and 96 with cylinder 88, the housing portion 85 has slotted openings 104, 105 in side wall 106 thereof outwardly of the adjacent walls of the actuating cylinder From Figure 1, in particular, it will be understood that the slide member 98 carries a semi-cylindrical cup portion 107 which is receptive of a diamond adjuster assembly indicated generally by numeral 110 in Figure 5. Assembly 110 includes a block member 111 having a threaded chamber 112 extending inwardly from one end thereof. A manually engageable adjustment screw 113 threads into Chamber 112, the same carrying a manually -engageable knob 114 at its outer end exteriorly of the block 111 and a wall portion 115 of the extending cup portion 107. The adjustment screw means 113 further includes an annular slot 116 intermediate its ends which is engaged by extending neck portion 117 of a set screw means 118 threaded into an opening 119 formed in wall 120 of the cup portion 107. Wall portion 120 also carries two set screws 121, 121 for engaging the block 111, thus holding the block to the slide 98.' The outer end of the block 111 carries a pair of dressing diamond members 122 and 122a which are held in position in block 111 by set screw means 123. Normally such diamond members are vertically spaced as illustrated in Figure 4.

From the foregoing description, it will be understood that manipulation of adjustment knob means 114 and the adjustment screw means 113 moves the block 111 relative to the cup 107 thus manually advancing the diamond members to accommodate wear of the wheel. Adjustment of the position of the diamond members in this manner is an occasional operation normally limited to and considered to be a fine adjustment. It will also be understood and appreciated that the diamond members thus mounted are reciprocal with the cylinder 88 carried within the housing 85 of assembly 18 and that such assembly 18 is rotatable with shaft 60 of the hydraulic motor unit 17 while both units 17 and 18 are movable with the Vertical hydraulic piston and cylinder assembly 16.

Briefly, operation of the device may best be understood by the schematic drawing Figure 9 wherein the various hydraulic systems and major portions of the combination are set forth. As seen in that figure, the hydraulic piston and cylinder assembly 16 provides generally Vertical positioning of the dressing diamond members and the hydraulic motor assembly 17 serves to rotate the dresser head assembly 18 about a generally horizontal aXis between stop limts 75, 76 andl 77, the latter being insertable intermediate stops 75, 76 as desired. The dresser head assembly including particularly the movable cylinder 88 serves to reciprocate the diamond members along a rectilinear axis disposable at various angles of inclnation depending on the actuation of the hydraulic motor unit and the shaft 60 thereof which carries the assembly 18.

It will be recognized further from Figure 9 that a source of pressurized fluid 130 Supplies such fluid to conduit means 131 which is joined by three branch lines or conduits 132, 133 and 134. Branch conduit means 132 leads to a first control valve means 135 which is manually actuatable to selectively supply pressurized fluid to either one of two conduits 136 and 137 joining respectively to the inlet means 53 and 55 of the Vertical hydraulic cylinder and piston assembly 16. In particular,

the valve means includes an'actuating spool having crossover passageway means 138'and 139 so that'when such spool is actuated to a position wherein the passageway means 138 bridges between conduit 132 land 137 pressurized fluid is supplied to the upper side of piston 51 at inlet 55 with return to sump via conduit 136 and passageway 139. When the actuating spool is in the position, as illustrated in Figure 9,l pressurized fluid flows directly through conduit 132 to inlet 53 at the under side of the psiton 51.

The branch conduit 133 joins to the manually actuated selector valve 61 operable to selectively supply pressurized fluid to 'conduits 140 and 141 supplying the hydraulic motor of assembly 17 so as to control the direction of rotation for the shaft 60 thereof.

The third branch conduit means 134 leads directly to a third manually operable control valve means 143 selectively operable to control the passage of pressurized fluid to the supply conduits 95 and 96 associated with the cylinder 88 of assembly 18.

Suitable shut off valves 144, 145 and 146 are employed, respectively, in conduits 137, 140 and 96 for shutting down the operation of valve means 135, 61 and 143 and the return of pressurized fluid to the sump means indicated generally by 150 and diagrammed in' association with each of the manually operable control valves. A pressure gauge 151 with a manual shut off valve 152 is associated with the main supply conduit means 131 for indicating the pressure of the fluid being supplied to the various valve and Operating assemblies 16, 17 and 18.

With the above described arrangement, it will be understood that actuation of the Vertical piston and cylinder assembly 16 serves to position the hydraulic motor and dressing head at desired elevations with respect to a grinding wheel 22, as shown in Figure 1. The actuation of the hydraulic motor 59 servesr to rotate shaft 60 and assembly 18 to desired positionsof angularity as determined by the adjustable alignment of the stop member 75 and 76 thereby to position the reciprocating and rectilinear axis defined by the piston rod means 89 to accommodate desired angular faces of a dressing wheel as, for example, faces 155 and 156 of wheel 22. Positioning of the cutting diamonds 122 and 12211 in contact with the faces 155 and 156 of the grinding wheel is accomplished through the operation of the manually operable feed screw means 24 with fine adjustments for the wear of the diamond and the wheel being accomplished through the manipulationof the screw means 113 and manually engageable knob means 114 associated With the block 111 carrying the two dressing diamonds.

A's shown in the schematic Figures 10-14 of the drawmgs, accomplishment of a symmetrical angular or V- shaped cutting edge on the grinding wheel 22 with the planar faces of the V being interconnected by a radius is carried forth by positioning the two dressing diamonds m co-planar alignment with facey 155 of the grinding wheel, for example; this position being accomplished by actuating the hydraulic motor unit and rotating shaft 60 thereof to bring the same against one of the stops 75 or 76. In this condition, the valve means 143 is actuated to pass the diamonds across face 155 in a rectilinear path according to the actuation of the cylinder 88 of assembly 18; diamond 122 serving to dress face 155. The length of stroke of such rectilinear movement for the cylinder 88 is determined by the posit1on of one or the other of the stop pins 94 and 103 associated with assembly 18. At the end of such rectilinear stroke, the diamond heads are positioned substantially as shown in Figure 11; the two diamond heads 122 and 122a having moved from the Figure 10 position according to the direction of arrow A to their Figure 11 position wherein the apex 157 or intersection between faces 155 and 156 of the grinding wheel 22 lies intermediate the two dressing diamonds. Valve means 61 Vaasasst' is then` actuated to rotate shaft 60 of the hydraulic motor from stop 75 to stop 76 or vice versa, as the case may be, ydepending on the initial` starting position of shaft 60. This activity serves to dress the radius at the apex 157, as illustrated in Figure 12 of theV drawi'ngs, trailing diamond 122 forming such dressing operation. At completion of this movement, the diamonds will be al'igned at the opposite angle from their initial starting position, as shown in Figure 13, or that is, in contacting co-planar position with surface 156 of the grinding wheel 22. Valve 143 is again operated, this time to reverse the cylinder 88 moving the diamonds according to direction of arrow B in Figure 14, thus dressing face 156 of the grinding wheel. In this instance, diamond 122a dresses face 156.

While the above description for dressing a substantially V-shaped periphery of the grinding Wheel has been set forth, it is obvious that lvarious combinations of rectilinear and rotational movement for the dressing diamonds may be carried out as desired to effect dressing of desired contours at the periphery of the rotating grinding wheel. A straight Vertical grinding face on the wheel may be accomplished first by holding the diamonds substantially in their Figure 12 position and reciprocating or moving such past the face of the wheel by actuating the Vertical piston and cylinder means 16. Likewise, combinations of Vertical movement and rotational movement may be used to dress a straight and single radius or double radius combination, the radii appearing at the upper and lower edges of the wheel and the intermediate stop 77 being employed to interrupt rotation of shaft 60 between the limit stop 75 and 76. While other specific examples are too numerous to mention herein, it is important to recognize that the device of the present invention utilizes in a new and improved manner, the desirous effects of movement for the dressing diamonds along three aXes; two of which are rectilinear and reciprocal while the third axis provides rotation between limits.

From the foregoing, it is believed that those familiar with the art will recognize the features and merit of my present invention and will understand that while I have herein shown and described the same in association with a preferred embodiment of its concepts and teachings, such may nevertheless be subject to changes, modifications and substitutions of equivalents without necessarily departing from the inventive combinations involved therein. As a consequence, it `is not my intention to be limited to the particular form of device and mechanism herein described and shown except as may appear in the following appended claims.

I claim:

1. An apparatus for dressing grinding Wheels comprising, first hydraulic cylinder and piston means having a' stationary cylinder and a movable piston rod, motor means mounted for rectilinear movement with the said piston rod, a shaft rotatable by said motor and definingf. a rotatable axis substantially transverse to said piston rod, second hydraulic cylinder and piston means .having a stationary piston and a movable cylinder, means mounting said second hydraulic means transversely to .Said shaft for rotation therewith, a grinding wheel abrading means movable with the cylinder of said second hydraulic means Whereby said abrading means is movable rectilinearly along either of two transversely related axes by selected actuation of said first and second hydraulic means and is` rotatable with said shaft means about a third axis related transversely to both of its said axes of rectilinear movement thereby to form selected contours on the grinding wheel by employing various combinations of rotational and rectilinear motion thereof..

2. The combination as set forth in claim 1 including adjustable stop members for limiting rotation of said shaft at selected limits thereby to accordingly restrict rotational movement of said abrading means about said third axis.

3. For use with a grinding machine having a Vertical spindle head and a rotatably driven and generally horizontally disposed grinding wheel, an improved apparatus for dressing various contours on the periphery of the grinding wheel, comprising, wheel abrading means, first hydraulic cylinder and piston means in which the piston is reciprocated along a generally Vertical axis, hydraulic motor means carried by said piston means for rectilinear displacement therewith and including a shaft member rotatable between limits in clockwise and counterclockwise directions, second hydraulic cylinder and piston means mounted at one end of said shaft means for rotational movement with the latter, the cylinder of said second hydraulic cylinder and piston means being movable rectilinearly and transversely of said shaft member, and means for supporting said wheel abrading means on the said cylinder of said second hydraulic cylinder and piston means whereby said abrading means may be moved vertically relative to the grinding Wheel by actuation of said first hydraulic cylinder and piston means and rectilinearly relative thereto along Various aXes disposed at selected positions `of angularity With respect to the plane of said wheel through the 'actuation of said motor and second hydraulic cylinder and piston means.

4. A device for dressing planar and curvilinear contours on the cutting edge of a rotatably driven grinding wheel, comprising, first actuating means rectilinearly reciprocal along an axis disposed generally transverse to the plane of the grinding wheel and outwardly of the periphery thereof, rotatable shaft means disposed at one end of said first means and defining a rotational axis generally transverse of the axis of rectilinear motion for said first means, motor means carried by said first means for rotating said shaft means, second actuating means disposed at one end of said shaft means for rotation therewith, said second actuating means being rectilinearly reciprocal along an axis transverse to the rotational axis of said shaft means, wheel ahrading means carried by said Second actuatng means for engaging the peripheral edge of the grinding wheel,'-and means for selectively Operating said first and second actuating means and said motor means whereby said wheel abrading means may be moved along rectilinear paths to form planar surfaces on the peripheral edge of said grinding wheel in response to operation of said first and second actuating means and may additionally be moved along arcuate paths through the rotational actuation of said shaft means.

5. The combination as set forth in claim 4 including stop members selectively positioned to limit rotational movement of said shaft means thereby to limit arcuate movement of said abrading means.

6. The combination as set forth in claim 4 including manually operable means for displacing said first rectilinearly movable means transversely of the axis of rotation for the grinding wheel and additional manually operable means for rectilinearly displacing the wheel abrading means transversely of the axis of movement for said second actuating means.

References Cited in the file of this patent UNITED STATES PATENTS 2,409,240 Barker et al Oct. 15, 1946 2,766,559 Pivley Oct. 16, 1956 FOREIGN PATENTS 494,704 Great VBritain Oct. 31, 1938 295,172 Switzerland Dec. 15, 1953 

